EP0324733A1 - A moisture indicator. - Google Patents
A moisture indicator.Info
- Publication number
- EP0324733A1 EP0324733A1 EP87902090A EP87902090A EP0324733A1 EP 0324733 A1 EP0324733 A1 EP 0324733A1 EP 87902090 A EP87902090 A EP 87902090A EP 87902090 A EP87902090 A EP 87902090A EP 0324733 A1 EP0324733 A1 EP 0324733A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- prism
- moisture
- absorption part
- substrate
- visible
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000010521 absorption reaction Methods 0.000 claims abstract description 31
- 230000003287 optical effect Effects 0.000 claims abstract description 11
- 239000000758 substrate Substances 0.000 claims abstract description 10
- 239000000463 material Substances 0.000 claims description 15
- -1 acryl Chemical group 0.000 claims description 3
- 230000009102 absorption Effects 0.000 claims 5
- 241000735235 Ligustrum vulgare Species 0.000 claims 2
- 241000196324 Embryophyta Species 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 3
- 239000007788 liquid Substances 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 230000002745 absorbent Effects 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 239000011162 core material Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- KRTSDMXIXPKRQR-AATRIKPKSA-N monocrotophos Chemical compound CNC(=O)\C=C(/C)OP(=O)(OC)OC KRTSDMXIXPKRQR-AATRIKPKSA-N 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/41—Refractivity; Phase-affecting properties, e.g. optical path length
- G01N21/43—Refractivity; Phase-affecting properties, e.g. optical path length by measuring critical angle
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/02—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by gauge glasses or other apparatus involving a window or transparent tube for directly observing the level to be measured or the level of a liquid column in free communication with the main body of the liquid
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/28—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
- G01F23/284—Electromagnetic waves
- G01F23/292—Light, e.g. infrared or ultraviolet
- G01F23/2921—Light, e.g. infrared or ultraviolet for discrete levels
- G01F23/2922—Light, e.g. infrared or ultraviolet for discrete levels with light-conducting sensing elements, e.g. prisms
Definitions
- British Patent Application 2,059,077 discloses a device similar to that described above except that in place of paper the absorption part is formed by a hydroscopic material, such as calcium hydroxide, which is non-transparent in crystalline form (when dry) but transparent when it is in the form of a solution (i.e. moist).
- a hydroscopic material such as calcium hydroxide
- the absorption part in all the above-mentioned devices either changes colour or becomes partly colour ⁇ less when it gets wet.
- a disadvantage thereof is the poor contrast. Even a slight drying causes the contrast moist/dry to get obscure.
- Finnish Patent Application 844,584 discloses a rod-like moisture indicator the operation of which is based on the change of the critical angle of the total reflection.
- FIG. 2 shows the moisture indicating device 7 operating on the prism principle as seen in the direction to the viewing surface 2.
- the device comprises two prisms 1 and 1 r which are attached opposite to each other as shown in Figure 3.
- the viewing angle at which either of the prisms shows a surface 7 and 7' indicating absence of moisture, when surfaces 4 and 4' are dry, is altogether about 60°.
- the viewing surface 2 and 2' of the prisms are not accurately parallel, so that at a viewing angle of 90 , both surfaces are made to indi ⁇ cate absence of moisture at the same time, which makes the indication more intense.
- a body 8 presses the absorption part 5 tightly against the prism surfaces 4 and 4'.
- the absorption part is a strip made of a porous material (such as filter paper made of a glass fibre material). One end of the strip protrudes from an absorption opening 9 of the body to make contact with a substrate the moisture of which is to be determined.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Fluid Mechanics (AREA)
- General Health & Medical Sciences (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- Thermal Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analysing Materials By The Use Of Chemical Reactions (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
- Cold Air Circulating Systems And Constructional Details In Refrigerators (AREA)
- Thermistors And Varistors (AREA)
- Luminescent Compositions (AREA)
- Indole Compounds (AREA)
- Cable Accessories (AREA)
- Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT87902090T ATE68265T1 (en) | 1986-09-30 | 1987-03-13 | HUMIDITY INDICATOR. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FI863947A FI78564C (en) | 1986-09-30 | 1986-09-30 | FUKTIGHETSINDIKATOR. |
FI863947 | 1986-09-30 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0324733A1 true EP0324733A1 (en) | 1989-07-26 |
EP0324733B1 EP0324733B1 (en) | 1991-10-09 |
Family
ID=8523240
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP87902090A Expired - Lifetime EP0324733B1 (en) | 1986-09-30 | 1987-03-13 | A moisture indicator |
Country Status (10)
Country | Link |
---|---|
US (1) | US4846572A (en) |
EP (1) | EP0324733B1 (en) |
JP (1) | JPH0820362B2 (en) |
AT (1) | ATE68265T1 (en) |
DE (1) | DE3773681D1 (en) |
DK (1) | DK168462B1 (en) |
FI (1) | FI78564C (en) |
NO (1) | NO176374C (en) |
SU (1) | SU1718737A3 (en) |
WO (1) | WO1988002485A1 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6766762B2 (en) * | 2001-10-05 | 2004-07-27 | Purdue Research Foundation | Indicator device for soil |
US20030080304A1 (en) * | 2001-10-31 | 2003-05-01 | Flow-Rite Controls, Inc. | Apparatus and method for monitoring soil moisture conditions and for maintaining soil moisture conditions |
FR2840068A1 (en) * | 2002-05-27 | 2003-11-28 | Vincent Letocart | Water or moisture detector for closed chamber wall comprises sensory element of a material that loses its mechanical resistance in presence of moisture |
US20110107825A1 (en) * | 2009-11-12 | 2011-05-12 | Jenkinson Byron J | Anaerobic soil indicator device |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2943530A (en) * | 1956-10-26 | 1960-07-05 | Elastic Stop Nut Corp | Optical indicator for liquid level |
US3026718A (en) * | 1959-12-15 | 1962-03-27 | Matson Randolph | Soil moisture indicating gage |
US3045477A (en) * | 1961-03-02 | 1962-07-24 | Matson Randolph | Soil moisture indicating gage |
US3345870A (en) * | 1963-11-26 | 1967-10-10 | Yoshinaga Prince Kabushiki Kai | Fuel level indicator |
US3364733A (en) * | 1964-01-16 | 1968-01-23 | Comstock & Wescott | Liquid content indicating container |
GB1158573A (en) * | 1966-02-16 | 1969-07-16 | Lambert S Lancaster Ltd | Improvements in or relating to Moisture Determining Devices |
US3824844A (en) * | 1973-05-11 | 1974-07-23 | Water Rite Inc | Soil moisture monitor |
FR2301013A1 (en) * | 1975-02-12 | 1976-09-10 | Anquetin Jacques | Plant pot soil humidity warning device - has sponge escutcheon through pot wall to indicating paper in escutcheon and covered by element |
DE2726082A1 (en) * | 1977-06-10 | 1978-12-21 | Bosch Siemens Hausgeraete | OPTICAL LIQUID LEVEL INDICATOR, ESPECIALLY FOR HOUSEHOLD APPLIANCES, SUCH AS DISHWASHERS AND WASHING MACHINES, WITH A LIGHT CONDUCTING BAR |
US4130012A (en) * | 1977-11-25 | 1978-12-19 | Design Loft Creations, Inc. | Soil moisture indicator |
GB2152669A (en) * | 1984-01-10 | 1985-08-07 | Thorn Emi Domestic Appliances | A liquid level indicator |
-
1986
- 1986-09-30 FI FI863947A patent/FI78564C/en not_active IP Right Cessation
-
1987
- 1987-03-13 WO PCT/FI1987/000033 patent/WO1988002485A1/en active IP Right Grant
- 1987-03-13 DE DE8787902090T patent/DE3773681D1/en not_active Expired - Lifetime
- 1987-03-13 EP EP87902090A patent/EP0324733B1/en not_active Expired - Lifetime
- 1987-03-13 AT AT87902090T patent/ATE68265T1/en not_active IP Right Cessation
- 1987-03-19 JP JP62065525A patent/JPH0820362B2/en not_active Expired - Fee Related
-
1988
- 1988-05-19 NO NO882190A patent/NO176374C/en not_active IP Right Cessation
- 1988-05-27 DK DK290888A patent/DK168462B1/en not_active IP Right Cessation
- 1988-05-27 SU SU884355831A patent/SU1718737A3/en active
- 1988-09-29 US US07/253,348 patent/US4846572A/en not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO8802485A1 * |
Also Published As
Publication number | Publication date |
---|---|
DK290888A (en) | 1988-05-27 |
DK168462B1 (en) | 1994-03-28 |
DE3773681D1 (en) | 1991-11-14 |
FI863947A0 (en) | 1986-09-30 |
FI863947A (en) | 1988-03-31 |
ATE68265T1 (en) | 1991-10-15 |
DK290888D0 (en) | 1988-05-27 |
JPH0820362B2 (en) | 1996-03-04 |
SU1718737A3 (en) | 1992-03-07 |
NO882190D0 (en) | 1988-05-19 |
NO176374C (en) | 1995-03-22 |
WO1988002485A1 (en) | 1988-04-07 |
JPS6390742A (en) | 1988-04-21 |
US4846572A (en) | 1989-07-11 |
NO176374B (en) | 1994-12-12 |
FI78564B (en) | 1989-04-28 |
EP0324733B1 (en) | 1991-10-09 |
FI78564C (en) | 1989-08-10 |
NO882190L (en) | 1988-05-19 |
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